Cron Parser

What is the Cron Parser?

The Cron Parser turns cryptic cron expressions into plain English. Paste any standard 5-field expression (minute, hour, day-of-month, month, day-of-week) and instantly see what it means, when it runs next, and exactly what each field allows.

Features

  • Human-readable descriptions — 0 9 * * 1-5 becomes "At 09:00 on weekdays"
  • Next execution times — preview up to 10 upcoming runs, shown in your local timezone with relative offsets ("in 3h 12m")
  • Field-by-field breakdown — every field expanded into its allowed values with a per-field explanation
  • Full syntax support — wildcards (*), lists (1,15), ranges (9-17), steps (*/15, 9-17/2), and month/weekday names (JAN, MON)
  • Specific validation errors — not just "invalid", but *why*: out-of-range values, reversed ranges, wrong field counts
  • Standard cron semantics — including the day-of-month / day-of-week OR rule and 0/7 both meaning Sunday

How to use

1. Type or paste a cron expression into the input bar, or pick a preset.

2. Read the plain-English description at the top.

3. Check the next run times and the field breakdown table to confirm the schedule does what you expect.

Privacy

All parsing happens entirely in your browser. Your expressions are never sent to any server.

Read the full Cron Parser guide and the Cron Parser API reference.